<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Dom测试题</title>
</head>
<body>
    <div id="test">
        <div class="son1">son1</div>
        <div class="son2">son2</div>
        <div class="son3">son3</div>
    </div>
    <div id="test1">
        <div class="son1">son11</div>
        <div class="son2">son22</div>
        <div class="son3">son33</div>
    </div>
    <script src="dom.js"></script>
    <script src="main.js"></script>
</body>
</html>